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Tested my battery. Check my numbers please!?

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    #1

    Tested my battery. Check my numbers please!?

    Went for a 25 mile ride today, and the bike stalled when coming to a stop off of high revs a couple of times. Toward the end of my trip, it stalled and wouldn't start again. I could feel the battery draining, so instead of cranking and cranking and cranking, I popped the clutch in second and she started right up. (Would never have known to try that had it not been for the GSR!)

    So I decided to test my battery. I didn't charge it first, so keep that in mind.

    With my multimeter set to 20v, I got:

    Off:12.68v
    Lights on: 12.03v
    Idle: 13.40 - 13.50v
    2500 rpms: 13.40 - 13.45v
    5000rpms: It was steadily climbing, starting at 13.40v and it made it up to 13.65v then settled immediately down to 13.30v.

    I decided to try it again then, so then I got readings of -

    2500rpms: 13.75 - 13.90v, finally settling at 14.00v
    5000rpms: 13.45v

    So,...how's she look? I'm still planning on going through and cleaning all the connections, but I've got some questions for that, which I'll bring up in another thread.
    Last edited by Guest; 04-11-2006, 03:03 PM.
    Tags: None
    #2
    When you say 13.XX - 90V, do you mean the V intermittently spikes up to 90V??!!

    Comment

      #3
      Originally posted by crc1214
      When you say 13.XX - 90V, do you mean the V intermittently spikes up to 90V??!!
      No. 13.75-13.90v

      Wavering .15v

      Fixed it in the original post.

      Comment

        #4
        You'll get weird numbers if your battery isn't fully charged and in good condition.

        Charge her up using a trickle charger, and let the V level off. The battery should hold 12.6V or higher.

        Then test. If the numbers are still wierd, have the battery load tested.
        Believe it or not I had a Honda once that showed undercharging. The battery would hold 12.6V. All the charging system components bench tested out OK, so I had the battery load tested. It was bad. Got a new battery and everything was solved.

        Comment

          #5
          So this is pretty pointless, given that I didn't give the battery a full charge first?

          Comment

            #6
            I hate to say it - but you hit the nail on the head. Definitely charge up that battery and make sure it's in good shape before you diagnose any further.

            Comment

              #7
              Damn. I was hoping those secondary numbers would be okay to go by, since the bike had been running a bit by then.

              Comment

                #8
                As CRC said, voltage numbers don'ttell the whole story. I had an '88 Honda Hurricane 1000 that had a strange battery problem. The battery would read good voltage and spin the engine reasonably well but it was very difficult to start. It would start immediately with a push start. I also noticed it would sometimes start when I released the starter button. I did some research and found this is not uncommon. The battery was weak under load which reduced the voltage to the ignition enough when the starter was engaged that it didn't fire. When the starter switch was released the motor was still spinning a bit and the ignition got some voltage back and the bike would fire up. A new battery resolved the problem.

                Thanks,
                Joe
                IBA# 24077
                '15 BMW R1200GS Adventure
                '07 Triumph Tiger 1050 ABS
                '08 Yamaha WR250R
                "Krusty's inner circle is a completely unorganized group of grumpy individuals uninterested in niceties like factual information. Our main purpose, in an unorganized fashion, is to do little more than engage in anecdotal stories and idle chit-chat while providing little or no actual useful information. And, of course, ride a lot and have tons of fun.....in a Krusty manner."

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                  #9
                  Ditto. My last battery had good numbers when charged, but it lost power very rapidly.

                  Comment

                    #10
                    Yeah, but going by the Stator papers, this one has good numbers when it's not been charged.

                    Looking at the secondary readings for 2500 and 5000 rpms, which I got after the bike had been idling and revving for a bit, the voltage is right where the Stator papers say it should be for a good charging system.

                    I did, however, charge it about two or three weeks ago.

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                      #11
                      My bike doesn't charge when at idle , it maintains voltage and that's about it, usually about 12.0v , and starts charging at 1500 and increases the charge with rpm, and my stator will kill you at 5K 92-97 volts and the r/r is a honda shindegin (sp) . But my battery is loosing it and needs replaced soon, if it sits a week it may or may not start it and after a full night of 1amp charge it falls to 12.57 volts.

                      Comment

                        #12
                        12.68 when off seems pretty well charged to me. I just bought a new battery and the instructions say only to charge if voltage is below 12.8. Maybe charge it briefly to get back to 12.8-13 when off. Then see if it drains over time.

                        Comment

                          #13
                          Originally posted by rckrzy1
                          My bike doesn't charge when at idle , it maintains voltage and that's about it, usually about 12.0v , and starts charging at 1500 and increases the charge with rpm, and my stator will kill you at 5K 92-97 volts and the r/r is a honda shindegin (sp) . But my battery is loosing it and needs replaced soon, if it sits a week it may or may not start it and after a full night of 1amp charge it falls to 12.57 volts.
                          HOLY CRAP!! You are getting 92-97V at the battery at 5K?? If so, I strongly urge you to park that sucker and diagnose ASAP. You may have ran with that bad battery too long, and fried the R/R. Just get a new battery, that may even solve it completely!

                          If you keep throwing 92-97 V at that battery, you may soon have a TEXAS BATTERY MASSACRE!!!

                          Comment

                            #14
                            relax Chad!!! LOL he said he was getting 92-97 volts FROM the stator.

                            Comment

                              #15
                              Originally posted by focus frenzy
                              relax Chad!!! LOL he said he was getting 92-97 volts FROM the stator.
                              Exactly, so be careful when checking those stator output lines, it's enough to shock you good or bad depending .

                              Comment

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